void main() { char str[256]; int i,j,b;
gets(str);
j=0; while ( str[j] ) j++; j--;
i=0; b=1; while ( j>i ) { if ( str[i]!=str[j] ) { b=0; break; } i++; j--; }
if ( b==0 ) printf("No.\n"); else printf("Yes.\n");
}